You really need to push your GP practice, and make a formal complaint to the practice manager if necessary.
I'm not T1, but I've been T2 for 25 years. At first, the surgery was really good. I had a brilliant couple of diabetic nurses I saw every six months for HBA1C and other monitoring and had a couple of consultations with their specialist diabetic GP.
Then it changed after about five years. The six monthly checks turned into yearly. It became HCA's who did the checks of feet, BP, blood test etc., A random "proper" nurse (not diabetic specialist) would phone up a week or so afterwards to tell me the HBA1C result and we'd have a very brief chat - usually her saying the usual spiel of the NHS factsheet, i.e. avoid mangoes etc!!
After a few years, of that being barely called "management", I started getting texts from the "nurse" after the HCA appointment, usually just a quick 2 line curt message of HBAIC satisfactory, not saying the level. So, I kind of lost interest myself, year after year, I was being "told" the HBA1C was "satisfactory" without knowing the level, and my home finger prick testing was OK when I rarely did it (never double digit 2 hours after food etc). So I basically started to forget about it.
Then came covid, and I had no testing at all for nearly two years as the surgery suspended all routine monitoring!
Then in 2022, had the usual annual HBA1C and the usual curt "satisfactory" text a week or two later. But my finger prick testing had gone crazy - double figures, very high pre-breakfast figures. So I contacted the surgery and asked for the HBA1C reading - it was a whopping 8.7!! (previous ones I'd known about were under 7, mostly under 6, as I was on drugs for it). I asked to speak to a diabetic nurse, but the receptionist refused as the GP had marked it down as "satisfactory" and told me I wasn't "entitled" to see a nurse for no reason!!
I later had a consultation with a GP for a different issue and I asked him to look at the HBAIC. He said it was far too high and made me an appointment with a diabetic nurse the following week. Then I finally started to get some action and support! Firstly, increased the drugs. Then some realistic diet/food/exercise ideas - she was really good! HBAIC tests every month for a few months to monitor and ensure it was coming back under control. She's said a few times, that she couldn't understand how I'd got so out of control despite being under their "management". As others have said, normal GPs don't seem to have a good understanding of diabetes anymore. The nurse once showed me the graph of my HBA1C readings on her screen and it showed a gradual rise every test/year, but just never picked up!!
Even better, as I made such good progress, both in terms of HBAIC and weight loss, I've now been temporarily put on a Libre constant monitoring system which is an absolute game changer and something I'd highly recommend to anyone. It gives me the tools to experiment with food and exercise, timing of meals, timing of drugs, etc., and my HBAIC is now down below 5.0, I've lost two stones in weight! She says they'll continue giving me the sensors whilst I'm losing weight and HBA1C is improving, as they really shouldn't be issuing it as I'm not actually eligible under NIC guidelines. She says she feels partly responsible for it getting out of control in the first place, and is using their "free" stock given by the suppliers as she can't issue to me on prescription!
Nice to finally have someone watching my back! It makes a massive difference and well worth fighting to get taken seriously by your GP practice and get someone showing an interest!